A. precision instruments
B. heating elements
C. motor starters
D. incandescent lamps
E. all of the above
Related Mcqs:
- Low resistivity materials are used in__________?
A. transformer, motor and generator windings
B. transmission and distribution lines
C. house wiring
D. all above applications - On which of the following factors does the resistivity of a material depend ?
A. Resistance of the conductor
B. Area of the conductor section
C. Length of the conductor
D. All of the above - By increasing impurity content in the metal alloy the residual resistivity always_____________?
A. decreases
B. increases
C. remains constant
D. becomes temperature independent - Which of the following affect greatly the resistivity of electrical conductors ?
A. Composition
B. Pressure
C. Size
D. Temperature - Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
A. increases
B. decreases
C. does not change - The resistivity of a metal is a function of temperature because_____________?
A. the amplitude of vibration of the atoms varies with temperature
B. the electron density varies with temperature
C. the electron gas density varies with temperature - Which of the following factors affect resistivity of metals ?
A. Age hardening
B. Alloying
C. Temperature
D. Cold work
E. All of the above - Which of the following high resistance materials has the highest operating temperature ?
A. Kanthal
B. Manganin
C. Nichrome
D. Eureka - Platinum is used in_____________?
A. electrical contacts
B. thermocouple
C. heating element in high temperature furnace
D. grids of special purpose vacuum tubes
E. all of the above - Spark plug makes use of which of the following materials for insulation ?
A. Porcelain
B. Slate
C. Asbestos
D. Glass
